﻿#region License, Terms and Author(s)
//
// ELMAH - Error Logging Modules and Handlers for ASP.NET
// Copyright (c) 2004-9 Atif Aziz. All rights reserved.
//
//  Author(s):
//
//      Atif Aziz, http://www.raboof.com
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//    http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
#endregion

namespace Elmah
{
    #region Imports

    using System;
    using System.Data.Common;

    #endregion

    static class DbProviderFactoryQuery
    {
        private static readonly Message<string, DbProviderFactory> _message = new Message<string, DbProviderFactory>();

        static DbProviderFactoryQuery()
        {
            _message.PushHandler(next => (sender, name) => DbProviderFactories.GetFactory(name));
        }

        public static IDisposable PushGetFactoryHandler(Func<Func<object, string, DbProviderFactory>, Func<object, string, DbProviderFactory>> binder)
        {
            return _message.PushHandler(binder);
        }

        public static DbProviderFactory GetFactory(string providerInvariantName)
        {
            return _message.Send(null, providerInvariantName);
        }

        public static DbProviderFactory FindFactory(string providerInvariantName)
        {
            try
            {
                return GetFactory(providerInvariantName);
            }
            catch (ArgumentException)
            {
                return null;
            }
        }
    }
}
